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EFFECTS OF Sb ADDITION ON CORROSION PROPERTIES OF Mg-5Al-2Sr ALLOY

Zili Liu, Zhu Xiaochun, Zhou Guibin, Jian Li

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Abstract

Corrosion weight loss,polarization techniques,electrochemical impedance spectroscopy(EIS) and corrosion morphology were used to estimate the impact of Sb addition on corrosion properties of Mg-5Al-2Sr alloys in 3.5%NaCl solution.Experimental results show that the initial corrosion types of Mg-5Al-2Sr-xSb(x=0, 0.3,0.6,1.0) alloy in 3.5%NaCl solution is pitting corrosion.Pitting originated in massive ternaryτphase and granular SbSr_2 phase.The larger amount and the bigger size of these phases corresponds to the poorer resistance.Mesh distribution Al_4Sr phase can become an effective barrier of corrosion.Adding 0.3%Sb not only refines theα-Mg matrix of Mg-5Al-2Sr alloy,but also promotes the formation of Al_4Sr phase which distributed more in network.The corrosion potential of the alloy shifts positive obviously,the corrosion current density and corrosion rate reduces,thus,the corrosion resistance of the alloy is improved.

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What this paper is about

Corrosion weight loss,polarization techniques,electrochemical impedance spectroscopy(EIS) and corrosion morphology were used to estimate the impact of Sb addition on corrosion properties of Mg-5Al-2Sr alloys in 3.5%NaCl solution.Experimental results show that the initial corrosion types of Mg-5Al-2Sr-xSb(x=0, 0.3,0.6,1.0) alloy in 3.5%NaCl solution is pitting corrosion.Pitting originated in massive ternaryτphase and granular SbSr_2 phase.The larger amount and the bigger size of these phases corresponds to the poorer resistance.Mesh distribution Al_4Sr phase can become an effective barrier of corrosion.Adding 0.3%Sb not only refines theα-Mg matrix of Mg-5Al-2Sr alloy,but also promotes the formation of Al_4Sr phase which distributed more in network.The corrosion potential of the alloy shifts positive obviously,the corrosion current density and corrosion rate reduces,thus,the corrosion resistance of the alloy is improved.

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Available abstract

Corrosion weight loss,polarization techniques,electrochemical impedance spectroscopy(EIS) and corrosion morphology were used to estimate the impact of Sb addition on corrosion properties of Mg-5Al-2Sr alloys in 3.5%NaCl solution.Experimental results show that the initial corrosion types of Mg-5Al-2Sr-xSb(x=0, 0.3,0.6,1.0) alloy in 3.5%NaCl solution is pitting corrosion.Pitting originated in massive ternaryτphase and granular SbSr_2 phase.The larger amount and the bigger size of these phases corresponds to the poorer resistance.Mesh distribution Al_4Sr phase can become an effective barrier of corrosion.Adding 0.3%Sb not only refines theα-Mg matrix of Mg-5Al-2Sr alloy,but also promotes the formation of Al_4Sr phase which distributed more in network.The corrosion potential of the alloy shifts positive obviously,the corrosion current density and corrosion rate reduces,thus,the corrosion resistance of the alloy is improved.

Key concepts: Corrosion, Materials science, Alloy, Dielectric spectroscopy, Pitting corrosion, Polarization (electrochemistry), Metallurgy, Ternary operation

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